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g0801_0900.s0874_walking_robot_simulation.readme.md Maven / Gradle / Ivy

874\. Walking Robot Simulation

Medium

A robot on an infinite XY-plane starts at point `(0, 0)` facing north. The robot can receive a sequence of these three possible types of `commands`:

*   `-2`: Turn left `90` degrees.
*   `-1`: Turn right `90` degrees.
*   `1 <= k <= 9`: Move forward `k` units, one unit at a time.

Some of the grid squares are `obstacles`. The ith obstacle is at grid point obstacles[i] = (xi, yi). If the robot runs into an obstacle, then it will instead stay in its current location and move on to the next command.

Return _the **maximum Euclidean distance** that the robot ever gets from the origin **squared** (i.e. if the distance is_ `5`_, return_ `25`_)_.

**Note:**

*   North means +Y direction.
*   East means +X direction.
*   South means -Y direction.
*   West means -X direction.

**Example 1:**

**Input:** commands = [4,-1,3], obstacles = []

**Output:** 25

**Explanation:**

The robot starts at (0, 0):

1. Move north 4 units to (0, 4).

2. Turn right.

3. Move east 3 units to (3, 4).

The furthest point the robot ever gets from the origin is (3, 4), which squared is 32 + 42 = 25 units away.

**Example 2:**

**Input:** commands = [4,-1,4,-2,4], obstacles = [[2,4]]

**Output:** 65

**Explanation:**

The robot starts at (0, 0):

1. Move north 4 units to (0, 4).

2. Turn right.

3. Move east 1 unit and get blocked by the obstacle at (2, 4), robot is at (1, 4).

4. Turn left.

5. Move north 4 units to (1, 8).

The furthest point the robot ever gets from the origin is (1, 8), which squared is 12 + 82 = 65 units away.

**Example 3:**

**Input:** commands = [6,-1,-1,6], obstacles = []

**Output:** 36

**Explanation:**

The robot starts at (0, 0):

1. Move north 6 units to (0, 6).

2. Turn right.

3. Turn right.

4. Move south 6 units to (0, 0).

The furthest point the robot ever gets from the origin is (0, 6), which squared is 62 = 36 units away.

**Constraints:**

*   1 <= commands.length <= 104
*   `commands[i]` is either `-2`, `-1`, or an integer in the range `[1, 9]`.
*   0 <= obstacles.length <= 104
*   -3 * 104 <= xi, yi <= 3 * 104
*   The answer is guaranteed to be less than 231.